@rysiek
Instantly defederating from an instance because of a spam attack isn't a solution either. Give people time to react. If they fail to react within a reasonable time or the attack is too big, then yea. Defederate. But defederation should be one of the last resorts. Nobody wants to create instances if they constantly have to be scared to be defederated whenever someone whines about them not reacting in 500ms if a bad message appears.
@furbyonsteroids no it is not. I used it to show that actions admins can take (like defederation or silencing) have huge drawbacks if the instance involved is gigantic.